Stellar X-ray variability and planetary evolution in the DS Tucanae system
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2025
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866917888948961280 |
|---|---|
| author | King, George W. Corrales, Lía R. Bourrier, Vincent Santos, Leonardo A. Dos Doyle, Lauren Lavie, Baptiste Ramsay, Gavin Wheatley, Peter J. |
| author_facet | King, George W. Corrales, Lía R. Bourrier, Vincent Santos, Leonardo A. Dos Doyle, Lauren Lavie, Baptiste Ramsay, Gavin Wheatley, Peter J. |
| contents | We present an analysis of four Chandra observations of the 45 Myr old DS Tuc binary system. We observed X-ray variability of both stars on timescales from hours to months, including two strong X-ray flares from star A. The implied flaring rates are in agreement with past observations made with XMM-Newton, though these rates remain imprecise due to the relatively short total observation time. We find a clear, monotonic decline in the quiescent level of the star by a factor 1.8 across eight months, suggesting stellar variability that might be due to an activity cycle. If proven through future observations, DS Tuc A would be the youngest star for which a coronal activity cycle has been confirmed. The variation in our flux measurements across the four visits is also consistent with the scatter in empirical stellar X-ray relationships with Rossby number. In simulations of the possible evolution of the currently super-Neptune-sized planet DS Tuc Ab, we find a range of scenarios for the planet once it reaches a typical field age of 5 Gyr, from Neptune-size down to a completely stripped super-Earth. Improved constraints on the planet's mass in the future would significantly narrow these possibilities. We advocate for further Chandra observations to better constrain the variability of this important system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_05571 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Stellar X-ray variability and planetary evolution in the DS Tucanae system King, George W. Corrales, Lía R. Bourrier, Vincent Santos, Leonardo A. Dos Doyle, Lauren Lavie, Baptiste Ramsay, Gavin Wheatley, Peter J. Earth and Planetary Astrophysics High Energy Astrophysical Phenomena Solar and Stellar Astrophysics We present an analysis of four Chandra observations of the 45 Myr old DS Tuc binary system. We observed X-ray variability of both stars on timescales from hours to months, including two strong X-ray flares from star A. The implied flaring rates are in agreement with past observations made with XMM-Newton, though these rates remain imprecise due to the relatively short total observation time. We find a clear, monotonic decline in the quiescent level of the star by a factor 1.8 across eight months, suggesting stellar variability that might be due to an activity cycle. If proven through future observations, DS Tuc A would be the youngest star for which a coronal activity cycle has been confirmed. The variation in our flux measurements across the four visits is also consistent with the scatter in empirical stellar X-ray relationships with Rossby number. In simulations of the possible evolution of the currently super-Neptune-sized planet DS Tuc Ab, we find a range of scenarios for the planet once it reaches a typical field age of 5 Gyr, from Neptune-size down to a completely stripped super-Earth. Improved constraints on the planet's mass in the future would significantly narrow these possibilities. We advocate for further Chandra observations to better constrain the variability of this important system. |
| title | Stellar X-ray variability and planetary evolution in the DS Tucanae system |
| topic | Earth and Planetary Astrophysics High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2501.05571 |